diff --git a/DESCRIPTION b/DESCRIPTION
index 727fc58..01bb8b4 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -77,5 +77,6 @@ Collate:
     'rasterizeLine.R'
     'prepExData.R'
     'roads-package.R'
+    'dem_example.R'
 BugReports: https://github.com/LandSciTech/roads/issues
 Roxygen: list(markdown = TRUE)
diff --git a/R/dem_example.R b/R/dem_example.R
index 22681e7..11e790b 100644
--- a/R/dem_example.R
+++ b/R/dem_example.R
@@ -46,6 +46,6 @@
 #' * ex_wat: a `PackedSpatRaster` of proportion water.
 #'
 #' @examples
-#' CLUSexample
-#' prepExData(CLUSexample)
-"CLUSexample"
\ No newline at end of file
+#' dem_example
+#' prepExData(dem_example)
+"dem_example"
\ No newline at end of file
diff --git a/man/CLUSexample.Rd b/man/CLUSexample.Rd
index d9c49c2..a380f79 100644
--- a/man/CLUSexample.Rd
+++ b/man/CLUSexample.Rd
@@ -1,5 +1,5 @@
 % Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/CLUSexample.R, R/dem_example.R
+% Please edit documentation in R/CLUSexample.R
 \docType{data}
 \name{CLUSexample}
 \alias{CLUSexample}
@@ -11,50 +11,17 @@ A named list with components:
 \item landings: an sf dataframe of points representing landing locations.
 \item roads: a \code{PackedSpatRaster} representing existing roads.
 }
-
-A named list with components:
-\itemize{
-\item ex_elev: a \code{PackedSpatRaster} of elevation.
-\item ex_wat: a \code{PackedSpatRaster} of proportion water.
-}
 }
 \usage{
 data(CLUSexample)
-
-data(dem_example)
 }
 \description{
 From Kyle Lochhead and Tyler Muhly's CLUS road simulation example. \code{SpatRaster}
 files created with the terra package must be saved with \code{\link[terra:wrap]{terra::wrap()}} and
 need to be unwrapped before they are used. \code{\link[=prepExData]{prepExData()}} does this.
-
-A list containing two rasters covering an area near Revelstoke, British
-Columbia, Canada. \code{ex_elev} is elevation data and \code{ex_wat} is the proportion
-of the cell that contains water. Both are subsets of data downloaded with the
-geodata package at 30 arc seconds resolution.\code{SpatRaster} files created with
-the terra package must be saved with \code{\link[terra:wrap]{terra::wrap()}} and need to be unwrapped
-before they are used. \code{\link[=prepExData]{prepExData()}} does this.
-}
-\details{
-Elevation data are primarily from Shuttle Radar Topography Mission (SRTM),
-specifically the hole-filled CGIAR-SRTM (90 m resolution) from
-https://srtm.csi.cgiar.org/.
-
-Water data are derived from the ESA WorldCover data set at 0.3-seconds
-resolution. (License CC BY 4.0). See https://esa-worldcover.org/en for more
-information.
 }
 \examples{
 CLUSexample
 prepExData(CLUSexample)
-CLUSexample
-prepExData(CLUSexample)
-}
-\references{
-Zanaga, D., Van De Kerchove, R., De Keersmaecker, W., Souverijns,
-N., Brockmann, C., Quast, R., Wevers, J., Grosu, A., Paccini, A., Vergnaud,
-S., Cartus, O., Santoro, M., Fritz, S., Georgieva, I., Lesiv, M., Carter,
-S., Herold, M., Li, Linlin, Tsendbazar, N.E., Ramoino, F., Arino, O., 2021.
-ESA WorldCover 10 m 2020 v100. doi:10.5281/zenodo.5571936.
 }
 \keyword{datasets}
diff --git a/man/dem_example.Rd b/man/dem_example.Rd
new file mode 100644
index 0000000..a8047f7
--- /dev/null
+++ b/man/dem_example.Rd
@@ -0,0 +1,45 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/dem_example.R
+\docType{data}
+\name{dem_example}
+\alias{dem_example}
+\title{Grade penalty example data}
+\format{
+A named list with components:
+\itemize{
+\item ex_elev: a \code{PackedSpatRaster} of elevation.
+\item ex_wat: a \code{PackedSpatRaster} of proportion water.
+}
+}
+\usage{
+data(dem_example)
+}
+\description{
+A list containing two rasters covering an area near Revelstoke, British
+Columbia, Canada. \code{ex_elev} is elevation data and \code{ex_wat} is the proportion
+of the cell that contains water. Both are subsets of data downloaded with the
+geodata package at 30 arc seconds resolution.\code{SpatRaster} files created with
+the terra package must be saved with \code{\link[terra:wrap]{terra::wrap()}} and need to be unwrapped
+before they are used. \code{\link[=prepExData]{prepExData()}} does this.
+}
+\details{
+Elevation data are primarily from Shuttle Radar Topography Mission (SRTM),
+specifically the hole-filled CGIAR-SRTM (90 m resolution) from
+https://srtm.csi.cgiar.org/.
+
+Water data are derived from the ESA WorldCover data set at 0.3-seconds
+resolution. (License CC BY 4.0). See https://esa-worldcover.org/en for more
+information.
+}
+\examples{
+dem_example
+prepExData(dem_example)
+}
+\references{
+Zanaga, D., Van De Kerchove, R., De Keersmaecker, W., Souverijns,
+N., Brockmann, C., Quast, R., Wevers, J., Grosu, A., Paccini, A., Vergnaud,
+S., Cartus, O., Santoro, M., Fritz, S., Georgieva, I., Lesiv, M., Carter,
+S., Herold, M., Li, Linlin, Tsendbazar, N.E., Ramoino, F., Arino, O., 2021.
+ESA WorldCover 10 m 2020 v100. doi:10.5281/zenodo.5571936.
+}
+\keyword{datasets}